diff options
| author | Greg Kroah-Hartman <gregkh@suse.de> | 2006-03-16 15:44:26 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-03-20 13:42:57 -0800 |
| commit | 641e6f30a095f3752ed84fd9d279382f5d3ef4c1 (patch) | |
| tree | 59b57c14f9249488ded6814de4512f7f9949289f /fs | |
| parent | c4a1745aa09fc110afdefea0e5d025043e348bae (diff) | |
| download | lwn-641e6f30a095f3752ed84fd9d279382f5d3ef4c1.tar.gz lwn-641e6f30a095f3752ed84fd9d279382f5d3ef4c1.zip | |
[PATCH] sysfs: sysfs_remove_dir() needs to invalidate the dentry
When calling sysfs_remove_dir() don't allow any further sysfs functions
to work for this kobject anymore. This fixes a nasty USB cdc-acm oops
on disconnect.
Many thanks to Bob Copeland and Paul Fulghum for taking the time to
track this down.
Cc: Bob Copeland <email@bobcopeland.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Cc: Maneesh Soni <maneesh@in.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/sysfs/dir.c | 1 | ||||
| -rw-r--r-- | fs/sysfs/inode.c | 6 |
2 files changed, 6 insertions, 1 deletions
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c index 49bd219275db..cfd290d3d6b1 100644 --- a/fs/sysfs/dir.c +++ b/fs/sysfs/dir.c @@ -302,6 +302,7 @@ void sysfs_remove_dir(struct kobject * kobj) * Drop reference from dget() on entrance. */ dput(dentry); + kobj->dentry = NULL; } int sysfs_rename_dir(struct kobject * kobj, const char *new_name) diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c index 689f7bcfaf30..6beee6f6a674 100644 --- a/fs/sysfs/inode.c +++ b/fs/sysfs/inode.c @@ -227,12 +227,16 @@ void sysfs_drop_dentry(struct sysfs_dirent * sd, struct dentry * parent) void sysfs_hash_and_remove(struct dentry * dir, const char * name) { struct sysfs_dirent * sd; - struct sysfs_dirent * parent_sd = dir->d_fsdata; + struct sysfs_dirent * parent_sd; + + if (!dir) + return; if (dir->d_inode == NULL) /* no inode means this hasn't been made visible yet */ return; + parent_sd = dir->d_fsdata; mutex_lock(&dir->d_inode->i_mutex); list_for_each_entry(sd, &parent_sd->s_children, s_sibling) { if (!sd->s_element) |